¹⁴C Can Be Used to Determine the Ages of Fossil

question 123

Multiple Choice

¹⁴C can be used to determine the ages of fossil organisms because

• A) all organisms contain many carbon compounds.
• B) ¹⁴C has a regular rate of decay to ¹⁴N.
• C) the ratio of ¹⁴C to ¹²C in living organisms is always the same as that in the atmosphere.
• D) the production of new ¹⁴C in the atmosphere just balances the natural radioactive decay of ¹⁴C.
• E) All of the above

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Definitions:

Norepinephrine

Neurotransmitter of the postganglionic fibers in the sympathetic division of the autonomic system; also, a hormone produced by the adrenal medulla. Sometimes referred to as noradrenaline.

Nuclear Envelope Pores

Structures in the nuclear envelope that allow the transport of molecules between the nucleus and the cytoplasm.

Steroid Hormones

A class of hormones derived from cholesterol that includes testosterone, estrogen, and cortisol, playing key roles in metabolism, inflammation, and reproductive functions.

Peptide Hormones

Hormones composed of short chains of amino acids that affect the function of target cells or organs.